Teething tube



FIG. 1 is a top, front, left perspective view of a teething tube, showing my new design;

FIG. 2 is a bottom, rear, right perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a front elevation view thereof, wherein the rear, left, and right views thereof are identical to the front elevation view.

The equal-length broken lines in the drawings depict portions of the teething tube that form no part of the claimed design. The dash-dot-dash broken lines define the boundaries of the claimed design. All broken lines form no part of the claim. 

CLAIM I claim the ornamental design for a teething tube, as shown and described. 